Transcript 7 - Lps.org

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Fundamentals of the Nervous System
and Nervous Tissue
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The nervous system has three
overlapping functions. Which of the
following represents a logical
sequence of these three functions?

a. sensory input, motor output, integration

b. motor output, integration, sensory input

c. sensory input, integration, motor output

d. integration, sensory input, motor output
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While studying for an exam, you reach
for a beverage. To extend your arm,
your _______ nervous system is
activated.
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a. afferent
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b. autonomic
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c. sympathetic
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d. somatic
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The door slams shut loudly and you
flinch. After a few seconds, you realize
that your heart is beating very rapidly
and forcefully. This response is the
result of your ______ nervous system.

a. afferent

b. sympathetic

c. central

d. somatic
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Complete the following analogy:
electrical wire is to electrical tape as
peripheral neurons are to________.

a. Schwann cells

b. oligodendrocytes

c. astrocytes

d. ependymal cells
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Each neuron in our bodies has an
estimated lifespan of _________.

a. 120 days

b. 10 years

c. 10 months

d. an average human lifespan
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“Nerves” are found in the ______ while
“tracts” are found in the ________.

a. PNS… CNS

b. CNS… PNS
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c. brain… legs and arms

d. spinal cord… brain
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The portion of an axon that contacts its
target is the _______.

a. dendrite
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b. axon

c. axon terminal/end knob

d. cell body
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The basis for differentiation between
gray matter and white matter in the
CNS is the presence of _______ in white
matter.

a. unmyelinated fibers
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b. myelinated fibers
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c. Schwann cells
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d. oligodendrocytes
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The ________ neurons comprise the
most common structural type of neuron
in humans.

a. psuedounipolar
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b. unipolar
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c. bipolar
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d. multipolar
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Sodium ion concentration in the
cytoplasm of a neuron ________
when its voltage-gated potassium
channels open.

a. increases

b. decreases

c. remains unchanged

d. increases 10x
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Sodium ion concentration in the
cytoplasm of a neuron ________
when its voltage-gated sodium
channels open.

a. increases

b. decreases
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c. remains unchanged
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d. decreases 10x
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The voltage displayed across a
resting neuron membrane is
termed the ________.

a. action potential
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b. excitatory potential
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c. resting membrane potential
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d. depolarized potential
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The point at which the all-or-none
principle of action potential
generation is reached is termed
the ________.

a. peak

b. depolarization point
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c. threshold

d. point of no return
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Stronger stimuli are interpreted
when the CNS receives ________
action potentials.

a. higher magnitude
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b. more frequent
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c. lower magnitude
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d. infrequent
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The location at which a neuron
interacts with its target (either
another neuron or a muscle, etc.) is
called the __________.
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a. synapse
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b. junction
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c. connection
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d. axoaxonal target